Artificial-lighting means.



' E. J. BRADY.- ARTIFICIAL LIGHTING MEANS. APPLICATION FILED JUNE13,1914.

Patented Dec. 22, 1914.

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Be it kno n hat' EDWARD BRADY, a citizen elf-the. United States, and a resident of. Philadelphia, he c unty of Philad phia and State f l n lsy a a e vented' certain new and useful Improvemerits in Artificial-Lighting Means, of

following is, a specification. The invention relates to color filters or absorbing sereens which operate to modify at ifi ia 'fl ght passi g th ug h so as to produce a resultant illumination equivalent to daylight, and this application is a divis on of my application serially numbered 796,552, filedOctober 22nd, 1913. I: .7

The principal objectof the present invention is to provide an efiicient color filter or absorbing screen which may be constructed wholly of glass and which may therefore assume various forms useful in the arts, such as bulbs for incandescent elec, tric lights and shades of various kinds. 4

The invention will be claimed at the'end hereof, but will be first described in connection with the accompanyingdrawings, in which v a Figure 1, is a transverse sectional view Q of a color filter-or absorbing screen embodying features of the invention,'and Fig. 2, is a diagrammatic View hereinafter referred I to for the sake of des ription.

that is yellow,

'ticularly to :Fig. 2,

Referring to the drawings and more pi rmatically represents, the spectrum. of daylight; the letters V, .I, l3,"G, Y, O and R, indicate the colors of that spectrum. The height'of the rectangle represents the intensity of the various'colors as present inthe spectrum of daylight. The curved line 2" indicates the relative intensity of the various colors in the spectrum of the artificial light which .it is desired to mod fy.

For the sake of illustration and explanation the spectrum of the artifical light source and the spectrum of the daylight source are drawn as of equal intensities at the extreme violet end. Artificial light sources as generically represented by the area included under the curve 2 are usually different from daylight in possessing an excess. of the longer spectrum wave engths,

orange and red. An absorbf mg screen or color filterorder to -alter the rectangle l diagram-l ofthe intensity of .7, indic t the abs rption diagrammaticallv adapted by absorption to produce the above perhaps more accurately, a very close approximat on to it.

described result, or

. I g 2, the approximation is indicated by the, Q t dl1n -3, and d tt d 1ines.4,, ,'6;.eud and the dotted separately.- For example,

line 7 indicates that red rays are absorbed from the artificial light, reducing the curve 2 to the line 7. Similarly the dotted lines 4, 5, and 6 represent other abexcessive radiations.

it frQm A COB-POM- sorptions supplementary to the absorptions 7 indicated by the line tion is that the color filter the globe or bulb of an electric "operated to make the y 7. The dotted line 3 indicates the net result of the various ah- I sorptions as has'been' stated.

In the present invention the color filter sorbing screen is of purple color and blue color. The pointof the present invenor screen may consist of glass, containing or embodying these colors and since it is of lass and is otherwise proper and effective pose in hand, it can be used, for

example, as light and in that case there is provided a source of artificial illumination which has light illumination is so far as I know at present unknown. v

I .am, of cohrse, aware ofthe fact that colorscreens r filters have been made or suggested, but I do not believethat there ever existed a source of light such as an electric lamp in which the globe or bulb electric lamp produce immediately andfdirectly the effect of daylight illumination.

To produce glass ofthe requisite generally blue color and absorbing qualities, use

as nickel 'oirid or salts,

is made of nickel which may be introduced or the purthe efi'ect of daylight and such a source of artificial dayand the use of this.

i fiatejiial for the piirpese" of making arti Lficialdaylight glass Ilbelieveto be, novel;

-'It,'is Well known that blue glas s can be" 4 proidl eed by the use of fcobalt.)

-R fei'ring'to-the drawings, glass oifplirple -.i"c obalt, is diagremmatieally. illustrated i551 fll'nixed together. e

- I' -,P0ta'ssium; i itl atenn" L0167I f- 1170. a bateh weighing dne thifd'ofa-pouiid Y 213 v loiid lfii O g may be" addedtq' produce the: rle qul ed kind ofpu 'pleglass, To. a simllar-fl "b h. r-the blue= 'gl:is's of required color. -When th s 2'5.

Potassium 1 cafbonate; .091: j (laleiuni .jcarbonate' .025 F .1.

61' 2 333' grains,- four grains of black n ickel cplpaltpxid may be added to produce is de'ne; the glasses .cah; be: mixedto ether;

P Instead-of idoihg this; the -1 1ickel 01nd and giving prepbrtion sfe fthe colorijh'gfma telfiailslt must: be bbriie' inlmind that the v By way. pf further 'des criptidnz liet limitatiom-itmay bevsaid that 'Wherepota sh "the. fellowing .propertiops -'and cobalt and m p Intestimony-whereof; signed my name-.. .5 :thehohaltbxidmay begedded to 'thebatth i res'nlt from any artifieial light under 1 consideratio'n, having regard to the thickness'of the glass. This islwell understood; by those skilled in-the art. A,"

It willbe obvious to those skilled in the- "tohe 'chariged so as to produce the desired art that modifications may benmdein" dBfi I elaifn is:

m1 illumiwhen viewedpby daylight.

*Eia'wit 'tl) J. BRADY Witnesses: v

- S. PATTERSON Emmi E. Fimucn'."

screen for tails without departing from the spirit of 1 the invention, hencethe sameis not limited further thanthe priorstate of the art ay ,equi're.

Wh t, v, (1', A color filter-6r absdrbin transformingthe light of m ti na ntsj'to daylight" character com rising, a glass compositipn containin -nicke and 00-, belt and beingof generall'yblue-colbr when t viewed-by daylight.

to transforming the flight-9f hrti cialfilhupina-nts'. to daylight character'- "comp i'siq a potash glass composition-c nta ining n 'el I generally bllie Color,

I have. hereuntd 

